The usefulness of revascularisation strategies for renal artery stenosis is the subject of debate following the publication of trials showing that percutaneous revascularisation is not superior to medical therapy alone1,2. Haemodynamic measurements of renal artery stenosis may help to identify better those patients suitable for revascularisation3. Renal flow reserve (RFR), the relative increase in blood flow velocity after maximal vasodilatation, may offer pivotal additional information on renal vascular reactivity and function and may help in selecting patients who may benefit from revascularisation. We studied the feasibility of intrarenal pressure and flow velocity measurements and examined the intra-individual ...
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